JP2020049497A - Plate material carry-in/out system - Google Patents

Abstract

To carry a plate material into a machining table by using 2-types of pallets having different width dimension.SOLUTION: In an X-axis direction side of a plate material machining machine 12, a one-piece collecting area PA and a product stacking area CA are arranged and provided in a Y-axis direction. In the one piece collecting area PA and the product stacking area CA, pallet supporting parts 26 (66) for supporting a large palette 16 are provided, respectively. A traveling lifter 64 can move to the Y-axis direction below the pallet supporting parts 26 (66), and the large palette 16 can be delivered between the pallet supporting parts 26 (66). A small pallet standby unit 70 having small pallet supporting parts 72 for supporting small pallets 18 is provided below the pallet supporting part 66 in the product stacking area CA. The small pallet supporting parts 72 are retractable to the position of not interfering with the traveling lifter 64, the large palette 16 on the traveling lifter 64, and the small pallets 18 on the traveling lifter 64.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a plate material carry-in / out system for carrying a plate material into and out of a plate material processing machine and carrying out a product as a processed plate material from the plate material processing machine.

  2. Description of the Related Art In recent years, plate material loading / unloading systems have become widespread in order to realize long-term automatic operation of a plate material processing machine such as a punch press. The configuration of a conventional plate material loading / unloading system (see Patent Document 1) will be briefly described as follows.

  The plate material loading / unloading system includes a box frame-shaped fixed frame provided on one side in the X-axis direction which is a horizontal direction in the plate material processing machine. The fixed frame extends in the Y-axis direction, which is a horizontal direction orthogonal to the X-axis direction. Inside the fixed frame, a single-sheet picking area for picking a single sheet from the plate material stacked on the pallet is formed. A product accumulation area for accumulating products, which are plate materials processed on the pallet, is formed at a position adjacent to the single-sheet pick-up area in the Y-axis direction inside the fixed frame.

  The board loading / unloading system includes a traveling lifter that supports the pallet so as to be able to move up and down. The traveling lifter is movable in the Y-axis direction between the pallet relay area and the single-sheet picking area. In other words, the traveling lifter transports the pallet between the pallet relay area and the single-sheet picking area. The pallet relay area refers to an area located on one side of the fixed frame in the Y-axis direction for receiving or transferring a pallet to a relay body such as a forklift.

  Although not described in Patent Literature 1, as one means, a pair of pallet receiving members as pallet support portions for supporting the end portion in the width direction of the pallet are provided on the product accumulation area side inside the fixed frame. It is provided so as to be separated and rotatable in the X-axis direction. Each pallet receiving member extends in the Y-axis direction and has a support piece for supporting an end portion in the width direction of the pallet. Each pallet receiving member is configured to switch between a supporting position in which the supporting pieces are in a horizontal state and a retracting position in which the supporting pieces are retracted upward from the horizontal state by the rotation thereof. This allows the pallet to be temporarily suspended in the product accumulation area while being separated from the traveling lifter, and another pallet can be transported by the traveling lifter.

JP 2004-90066 A

  By the way, with the diversification of the processing of the plate material processing machine, in addition to the pallet (large pallet) having the same size as the X-axis direction inside the fixed frame, a small pallet narrower than the pallet is used. There is a demand to carry plate materials into a processing machine. In order to meet the demand, it is necessary to temporarily suspend the small pallets in a product accumulation area in a state separated from the traveling lifter, and to transport another small pallet by the traveling lifter.

  Therefore, as a first measure, the dimension of the supporting piece of each pallet receiving member in the direction perpendicular to the Y-axis direction is reduced so that the supporting piece of each pallet receiving member can support the end portion in the width direction of the small pallet. It is conceivable to increase the length by an amount corresponding to the width of the pallet. On the other hand, if the first measure is taken, the mechanical strength of each pallet receiving member cannot be sufficiently ensured, and the first measure is not practical.

  As a second countermeasure, a pair of other pallet receiving members as small pallet supporting portions for supporting the widthwise ends of the small pallets in the product accumulation area are provided apart from each other in the X-axis direction. It is conceivable to raise and lower the pallet receiving member along a linear direction by a lifting cylinder. On the other hand, if the second measure is taken, the lifting cylinder is buried in the floor of the product accumulation area in order to avoid interference between the pallet being conveyed and other pallet receiving members and the like. Significant design changes are required.

  In other words, after ensuring sufficient mechanical strength of the pallet receiving member, the plate material can be loaded into the plate processing machine using two types of pallets having different width dimensions without making a significant design change of the plate material loading / unloading system. There is a problem that it is not easy to perform the above.

  Then, an object of the present invention is to provide a new board loading / unloading system which can solve the above-mentioned problems.

  The plate material loading / unloading system according to the first embodiment of the present invention is provided side by side in the X-axis direction of the plate material processing machine in the Y-axis direction, and integrates a single-sheet pick-up area and a product for picking a single work. A product stacking area, a pallet support section provided in the single-sheet pick-up area and the product stack area, respectively, for supporting a pallet, and movable in the Y-axis direction below the pallet support section, A traveling lifter capable of transferring the pallet to and from the pallet support portion, and a small pallet support portion provided below the pallet support portion in the product accumulation area and supporting a small pallet narrower than the pallet. And a small pallet standby unit. The small pallet support portion can be retracted to a position where the small pallet does not interfere with the traveling lifter, the pallet on the traveling lifter, and the small pallet on the traveling lifter.

  In the first embodiment of the present invention, the small pallet standby unit may have a swing link for swinging the small pallet support in the vertical direction. The pallet support may be switchable between a supporting position and a retracting position. The plate material carry-in / out system may include a relay body capable of temporarily holding the pallet in a Y-axis direction side of a carry-in / out area including the one-sheet pick-up area and the product accumulation area.

  According to the first embodiment of the present invention, the small pallet is temporarily separated from the traveling lifter in the product accumulation area without increasing the dimension of the small pallet support portion in the direction orthogonal to the Y-axis direction. , And another small pallet can be transported by the traveling lifter. Further, it is possible to avoid interference between the large pallet and the small pallet support portion while the traveling lifter conveys the large pallet without embedding the swing actuator on the floor of the product accumulation area.

  According to the present invention, the mechanical strength of the small pallet support portion is sufficiently ensured, and without significantly changing the design of the plate material loading / unloading system, using two types of pallets having different width dimensions, It is possible to carry the plate material into the plate material processing machine.

FIG. 1 is a schematic side view showing a plate material loading / unloading system according to an embodiment of the present invention. FIG. 2 is a schematic plan view showing the plate material carry-in / out system and the punch press according to the embodiment of the present invention. FIG. 3 is a schematic enlarged front view showing the configuration of the lower part in the single-sheet pick-up area. FIG. 4 is a schematic enlarged front view showing the configuration in the pallet relay area. FIG. 5 is a schematic enlarged front view showing the configuration of the lower part in the product accumulation area. FIG. 5 illustrates a state in which another small pallet is transported by the traveling lifter. FIG. 6 is a schematic enlarged front view showing the configuration of the lower part in the product accumulation area. FIG. 6 shows a state where the small pallet is supported by the traveling lifter. FIG. 7 is a schematic enlarged side view showing the configuration of the lower part in the product accumulation area. In FIG. 7, the illustration of the traveling lifter is omitted.

  An embodiment of the present invention will be described with reference to FIGS.

  In the specification and claims of the present application, “provided” means to be provided indirectly via another member in addition to being provided directly. The “X-axis direction” is one of the horizontal directions, and in the embodiment of the present invention, refers to the left-right direction. The “Y-axis direction” refers to a horizontal direction orthogonal to the X-axis direction, and in the embodiment of the present invention, refers to the front-back direction. In the drawings, "FF" indicates forward, "FR" indicates backward, "L" indicates leftward, "R" indicates rightward, "U" indicates upward, and "D" indicates downward. I have.

  As shown in FIGS. 1 and 2, a plate material loading / unloading system 10 according to an embodiment of the present invention includes a plate material (sheet metal) W loaded into a processing table 14 in a punch press (an example of a plate material processing machine) 12 and a processing table. 14 is a system for carrying out a product M which is a processed plate material from 14. Further, the plate material carrying-in / out system 10 uses a wide large pallet 16 and a narrow small pallet 18 as two types of pallets having different width dimensions. The specific configuration of the plate material loading / unloading system 10 is as follows.

  As shown in FIGS. 1 and 3, the plate material carry-in / out system 10 includes a box-frame-shaped fixed frame 20 provided on one side (side in the X-axis direction) of the processing table 14 in the X-axis direction. The frame 20 extends in the Y-axis direction. The fixed frame 20 includes a plurality of support members 22 and a plurality of beam members 24 integrally connected between appropriate support members 22 and extending in the X-axis direction or the Y-axis direction. The dimension in the X-axis direction inside the fixed frame 20 is set to a dimension corresponding to the width dimension (dimension in the X-axis direction) of the large pallet 16. Further, inside the fixed frame 20, a single-sheet picking area PA for picking one sheet from the plate material W stacked on the large pallet 16 or the small pallet 18 is provided. A product accumulation area CA for accumulating the products M on the large pallet 16 or the small pallet 18 is provided at a position adjacent to the single-sheet picking area PA in the Y-axis direction inside the fixed frame 20.

  A pair of large pallet support members 26 serving as pallet support portions for supporting the end side in the width direction (X-axis direction) of the large pallet 16 from below in the single-sheet pick-up area PA inside the fixed frame 20. They are spaced apart in the axial direction. Each large pallet support member 26 is made of an angle material extending in the Y-axis direction.

  In the single-sheet pick-up area PA, a pair of small pallet support members 30 as small pallet support portions for supporting the widthwise end portions of the small pallets 18 from below are separated from each other in the X-axis direction via support columns 32. It is provided. The pair of small pallet support members 30 are located at positions shifted vertically with respect to the large pallet support member 26. Each small pallet support member 30 is made of an angle material extending in the Y-axis direction. The interval between the pair of small pallet support members 30 in the X-axis direction is set to an interval corresponding to the width dimension of the small pallet 18.

  On the single-sheet picking area PA side inside the fixed frame 20, a single-sheet picking unit 36 for picking one sheet from the plate material W stacked on the large pallet 16 or the small pallet 18 is provided. The single-sheet pick-up unit 36 has a known configuration, and has a plurality of suction pads 38 for sucking the plate material W. A moving table 40 for supporting the plate material W or the product M is provided at an upper portion inside the fixed frame 20, and the moving table 40 is disposed between the single-sheet picking area PA and the product accumulation area CA in the Y-axis direction. Can be moved to The moving table 40 corresponds to a plate material moving unit that moves the single sheet material W from the single material area PA to the product accumulation area CA.

  As shown in FIGS. 1 and 2, the fixed frame 20 is provided with a carry-in / out unit 42 for carrying in the plate material W to the processing table 14 and carrying out the product M from the processing table 14. The carry-in / out unit 42 has a known configuration, and has a guide frame 44 provided on the fixed frame 20. The guide frame 44 extends in the X-axis direction from the product accumulation area CA to a position above the processing table 14. ing. The carry-in / out unit 42 is provided on the guide frame 44 so as to be movable in the X-axis direction, and has a loader 46 that holds (adsorbs) the plate material W or the product M.

  As shown in FIGS. 1 and 4, a box frame-shaped relay frame 48 is provided at a position separated from the fixed frame 20 on one side (frontward) in the Y-axis direction. The relay frame 48 includes a plurality of support members 50 and a plurality of beam members 52 integrally connected between appropriate support members 50 and extending in the X-axis direction or the Y-axis direction. The dimension in the X-axis direction inside the relay frame 48 is set to a dimension corresponding to the width dimension of the large pallet 16. Further, inside the relay frame 48, a pallet relay area RA for receiving or transferring the large pallet 16 or the small pallet 18 to or from the relay body 54 is provided. The relay body 54 is a moving body inherited for storing or storing the large pallet 16 or the small pallet 18 such as a forklift or a crane of an automatic warehouse. The relay 54 can temporarily hold the large pallet 16 or the small pallet 18 on the Y-axis direction side of the carry-in / out area including the single-sheet picking area PA and the product accumulation area CA. Note that the relay frame 48 does not need to be separated from the fixed frame 20 to one side in the Y-axis direction as long as it is located on one side in the Y-axis direction of the fixed frame 20.

  On the pallet relay area RA side inside the relay frame 48, a pair of large pallet support members 56 as pallet support portions for supporting the widthwise end of the large pallet 16 from below are separated in the X-axis direction. Is provided. Further, in the pallet relay area RA, a pair of small pallet support members 58 as small pallet support portions for supporting the end portions in the width direction of the small pallet 18 from below are provided in the X-axis direction via the support plates 60. They are provided separately. The pair of small pallet support members 58 are located at positions shifted vertically with respect to the large pallet support member 56. The interval between the pair of small pallet support members 58 in the X-axis direction is set to an interval corresponding to the width dimension of the small pallet 18.

  As shown in FIG. 1, a pair of guide rails 62 extending in the Y-axis direction are provided apart from each other in the X-axis direction from the floor (bottom) of the pallet relay area RA to the bottom of the single-sheet pick-up area PA. . The pair of guide rails 62 is provided with a traveling lifter (elevating vehicle) 64 that supports the large pallet 16 or the small pallet 18 so as to be able to move up and down. The traveling lifter 64 is movable in the Y-axis direction between the pallet relay area RA and the single-sheet pick-up area PA (below the pallet supporting portion such as the large pallet supporting member 26). In other words, the traveling lifter 64 conveys the large pallet 16 or the small pallet 18 between the pallet relay area RA and the single-sheet picking area PA. The traveling lifter 64 can transfer the large pallet 16 to and from a pallet supporting portion such as a pair of large pallet supporting members 56. The traveling lifter 64 can transfer the small pallets 18 to and from a small pallet supporting portion such as the pair of small pallet supporting members 30.

  As shown in FIGS. 1, 5, and 6, a pallet support portion that temporarily supports the end portion in the width direction of the large pallet 16 from below is provided on the product accumulation area CA side inside the fixed frame 20. A pair of large pallet receiving members 66 are rotatably provided apart from each other in the X-axis direction. Each large pallet receiving member 66 is made of an angle material extending in the Y-axis direction, and has a support piece 66f for supporting the end of the large pallet 16 in the width direction. Each large pallet receiving member 66 rotates the support piece 66f in a horizontal state (the position shown by a two-dot chain line in FIGS. 5 and 6) and rotates the support piece 66f upward from the horizontal state. It is configured to switch to the retracted evacuation posture (the posture indicated by the solid line in FIGS. 5 and 6). Further, in the vicinity of the product accumulation area CA in the fixed frame 20, a rotary cylinder 68 as a rotary actuator for the large pallet receiving member for rotating each large pallet receiving member 66 is provided.

  A small pallet standby unit 70 for temporarily waiting the small pallets 18 is provided at a lower portion in the accumulation area CA. The specific configuration of the small pallet standby unit 70 is as follows.

  As shown in FIGS. 1, 5 to 7, a pair of small pallet supporting portions for temporarily supporting the widthwise end side of the small pallet 18 from below is provided in the lower part of the product accumulation area CA. A small pallet receiving member 72 is provided. Each small pallet receiving member 72 is made of an angle member extending in the Y-axis direction. The interval between the pair of small pallet receiving members 72 in the X-axis direction is set to an interval corresponding to the width dimension of the small pallet 18.

  Two swing links 74 and 76 for vertically swinging the pair of small pallet receiving members 72 are connected between each small pallet receiving member 72 and the floor of the product accumulation area CA. Each of the two swing links 74 and 76 faces in parallel. The lower ends of the swing links 74 separated in the X-axis direction are integrally connected by a connection shaft 78 extending in the X-axis direction. The lower ends of the swing links 76 separated in the X-axis direction are integrally connected by a connection shaft 80 extending in the X-axis direction. The lower end of each swing link 74 is rotatably connected to the floor of the product accumulation area CA via an anchor bracket 82 and a connection shaft 78. The upper end of each swing link 74 is rotatably connected to the rear end of each small pallet receiving member 72 via a connecting pin 84. The lower end of each swing link 76 is rotatably connected to the floor of the product accumulation area CA via an anchor bracket 86 and a connection shaft 80. The upper end of each swing link 76 is rotatably connected to the front end of each small pallet receiving member 72 via a connecting pin 88.

  Each swing link 74 (76) is configured to switch between a standing posture (a posture indicated by a solid line in FIG. 7) and a lying posture (a posture indicated by a two-dot chain line in FIG. 7) by the vertical swing. I have. When each of the swing links 74 (76) is switched to the lying posture, each of the small pallet receiving members 72 is configured to be positioned lower than the transport height of the large pallet 16 and the small pallet 18 by the traveling lifter 64 ( (See FIG. 5). In other words, each small pallet receiving member 72 can be retracted to a position where it does not interfere with the traveling lifter 64, the large pallet 16 on the traveling lifter 64, and the small pallet 18 on the traveling lifter 64 by swinging downward. In the embodiment of the present invention, each small pallet receiving member 72, each of the two swing links 74 and 76, and the floor of the product accumulation area CA constitute a parallel link mechanism.

  An oscillating motor 90 as an oscillating actuator that oscillates all the oscillating links 74 and 76 in the vertical direction is provided at an appropriate position on the floor of the product accumulation area CA. An output shaft (not shown) of the oscillating motor 90 is operatively connected to one end of a connecting shaft 80 via a gear mechanism 92. In other words, the connection shaft 80 corresponds to a drive shaft that rotates by driving the swing motor 90, and the connection shaft 78 corresponds to a driven shaft that rotates following the rotation of the drive shaft.

  Subsequently, the operation and effect of the embodiment of the present invention will be described.

  The operation of loading the plate material W into the processing table 14 using the small pallet 18 is performed as follows.

  As shown in FIGS. 1 and 2, an empty small pallet 18 is supported by the traveling lifter 64 in the product accumulation area CA, and the small pallet 18 on which the plate material W is loaded is supported by a pair of small pallet support members 30. Next, the single sheet picking unit 36 picks one sheet from the plate material W stacked on the predetermined small pallet 18. Then, the moving table 40 is moved from the product accumulation area CA to the single-sheet pick-up area PA, and the suction state of the plurality of suction pads 38 in the single-sheet pick-up unit 36 is released. Further, the moving table 40 is moved from the single-sheet picking area PA to the product accumulation area CA, and the plate W is positioned in the product accumulation area CA. Then, the plate material W is carried into the processing table 14 by the carry-in / out unit 42.

  Thereafter, punching is performed on the plate material W by the punch press 12. Next, the product M is carried out of the processing table 14 by the carry-in / out unit 42. Then, while the movement of the product W in the Y-axis direction is restricted by a stopper (not shown), the moving table 40 is moved from the product accumulation area CA to the single-sheet picking area PA, so that the product W The product M is placed on the small pallet 18.

  By repeating the above-described operation, the loading of the plate material W to the processing table 14 and the like are performed a plurality of times, and a plurality of products M can be accumulated on the small pallet 18 supported by the traveling lifter 64.

  In addition, even when performing an operation such as loading the plate material W into the processing table 14 using the large pallet 16, the large pallet 16 on which the empty large pallet 16 is supported by the traveling lifter 64 and the plate material W is The same operation as described above is performed except that the large pallet supporting member 26 supports the large pallet.

  The standby operation of the large pallets 16 and the small pallets 18 in the product accumulation area CA is performed as follows.

  As shown in FIGS. 5 and 6, in the product accumulation area CA, the large pallet 16 is raised by the traveling lifter 64 to a position higher than the large pallet receiving member 66 in the retracted posture. Next, each large pallet receiving portion 66 is rotated by driving each rotary cylinder 68 to switch from the retracted position to the support position. Then, the large pallet 16 is lowered from the traveling lifter 64 to a pair of large pallet receiving members 66 by lowering the large pallet 16 to a lower position than the large pallet receiving member 66. Thus, the large pallet 16 can be temporarily suspended in the product accumulation area CA while being separated from the traveling lifter 64, and another large pallet 16 can be transported by the traveling lifter 64. As a result, the large pallet 16 can be exchanged between the single-sheet picking area PA and the pallet relay area RA.

  As shown in FIGS. 5 to 7, in the product accumulation area CA, while the pallet 18 is supported by the traveling lifter 64, all the swing links 74 and 76 are synchronized upward by driving the swing motor 90. By swinging, each swing link 74 (76) is switched from the lying posture to the standing posture. Then, each small pallet receiving member 72 rises along the direction inclined in the vertical direction to a height position corresponding to the small pallet 18 (see FIG. 6). Then, by lowering the small pallet 18 by the traveling lifter 64, the small pallet 18 can be transferred from the traveling lifter 64 to the pair of small pallet receiving members 72. Accordingly, the small pallets 18 can be temporarily made to stand by in the product accumulation area CA in a state of being separated from the traveling lifters 64, and the other small pallets 18 can be transported by the traveling lifters 64. As a result, the small pallets 18 can be exchanged between the single-sheet picking area PA and the pallet relay area RA (see FIG. 5).

  By driving the rocking motor 90, all the rocking links 74 and 76 are rocked synchronously downward, and each rocking link 74 (76) is switched from the standing posture to the lying posture. Then, each small pallet receiving member 72 descends along the direction inclined in the vertical direction. Thus, it is possible to avoid interference between the large pallet 16 and the small pallet receiving member 72 while the large pallet 16 is being conveyed by the traveling lifter 64.

  In short, according to the embodiment of the present invention, as described above, the interval in the X-axis direction between the pair of small pallet receiving members 72 is set to the interval corresponding to the width dimension of the small pallet 18. Two swing links 74 and 76 that swing vertically are connected between each small pallet receiving member 72 and the floor of the product accumulation area CA. The small pallet receiving member 72, the two swing links 74 and 76, and the floor of the product accumulation area CA constitute a parallel link mechanism. Therefore, the small pallets 18 are temporarily separated from the traveling lifter 64 in the product accumulation area CA without increasing the size of each small pallet receiving member 72 in the direction orthogonal to the Y-axis direction. The other small pallets 18 can be transported by the lifter 64. Further, it is possible to avoid interference between the large pallet 16 and the small pallet receiving member 72 while the large pallet 16 is being conveyed by the traveling lifter 64 without embedding the swing motor 90 on the floor of the product accumulation area CA. it can.

  Therefore, according to the embodiment of the present invention, the mechanical strength of each small pallet receiving member 72 is sufficiently ensured, and two types having different widths can be used without making a significant design change of the plate material carry-in / out system 10. By using the pallets 16 and 18, the plate material W can be carried into the processing table 14 and the product M can be carried out from the processing table 14.

  Note that the present invention is not limited to the description of the above-described embodiment, and can be implemented in various modes as follows, for example.

  When the traveling lifter 64 can move to the rear side of the single-sheet pick-up area PA, the large pallet 16 can be carried in from the rear side of the single-sheet pick-up area PA by configuring the large pallet support member 26 to be rotatable. When the large pallet 16 or the small pallet 18 is directly received or transferred from the traveling lifter 64 to the relay 54, the pair of large pallet support members 56 and the pair of small pallet support members 58 are omitted. You may.

  The scope of rights included in the present invention is not limited to the above-described embodiment.

10 Plate loading / unloading system 12 Punch press (Plate processing machine)
14 Machining table 16 Large pallet 18 Small pallet 20 Fixed frame 22 Support member 24 Beam member 26 Large pallet support member 26f Support piece 28 Rotary cylinder (rotary actuator for large pallet support member)
Reference Signs List 30 small pallet support member 30f support piece 32 support plate 34 rotary cylinder (rotary actuator for small pallet support member)
36 Single sheet pick-up unit 38 Suction pad 40 Moving table 42 Carry-in / out unit 44 Guide frame 46 Loader 48 Relay frame 50 Support member 52 Beam member 54 Relay 56 Large pallet support (pallet support)
58 Small pallet support (small pallet support)
60 Support plate 62 Guide rail 64 Travel lifter 66 Large pallet receiving member (Pallet support)
66f support piece 68 rotary cylinder (rotary actuator for large pallet receiving member)
70 Small pallet standby unit 72 Small pallet receiving member (small pallet support)
74 swing link 76 swing link 78 connecting shaft 80 connecting shaft 82 anchor bracket 84 connecting pin 86 anchor bracket 88 connecting pin 90 swing motor (swing actuator)
92 Gear mechanism PA Single-sheet picking area CA Product accumulation area RA Pallet relay area W Sheet metal (sheet metal)
M products

Claims (4)

A single-sheet picking area for picking a single piece of work and a product stacking area for stacking products, which are provided side by side in the Y-axis direction on the X-axis direction side of the sheet material processing machine;
A pallet support unit that is provided in the single-sheet pick-up area and the product accumulation area, respectively, and supports a pallet;
A travel lifter movable in the Y-axis direction below the pallet support portion and capable of delivering the pallet to and from the pallet support portion;
A small pallet standby unit having a small pallet support portion provided below the pallet support portion in the product accumulation area and supporting a small pallet narrower than the pallet;
A plate material loading / unloading system, wherein the small pallet support portion is retractable to a position where the small pallet does not interfere with the traveling lifter, the pallet on the traveling lifter, and the small pallet on the traveling lifter.   The plate material carrying-in / out system according to claim 1, wherein the small pallet standby unit has a swing link for swinging the small pallet support in the vertical direction.   The plate material carrying-in / out system according to claim 1, wherein the pallet supporting portion is switchable between a supporting position and a retracting position.   4. A relay body which can temporarily hold the pallet on a side in the Y-axis direction of a loading / unloading area including the single-sheet picking-up area and the product accumulation area. The plate material carry-in / out system according to any one of the above items.

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